org.checkerframework.dataflow.cfg.node.EqualToNode Maven / Gradle / Ivy

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The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.dataflow.cfg.node;

import com.sun.source.tree.BinaryTree;
import com.sun.source.tree.Tree.Kind;
import java.util.Objects;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A node for an equality check:
 *
 *  *   expression == expression
 * 
 */
public class EqualToNode extends BinaryOperationNode {

    /**
     * Create a new EqualToNode object.
     *
     * @param tree the tree for this node
     * @param left the first argument
     * @param right the second argument
     */
    public EqualToNode(BinaryTree tree, Node left, Node right) {
        super(tree, left, right);
        assert tree.getKind() == Kind.EQUAL_TO;
    }

    @Override
    public  R accept(NodeVisitor visitor, P p) {
        return visitor.visitEqualTo(this, p);
    }

    @Override
    public String toString() {
        return "(" + getLeftOperand() + " == " + getRightOperand() + ")";
    }

    @Override
    public boolean equals(@Nullable Object obj) {
        if (!(obj instanceof EqualToNode)) {
            return false;
        }
        EqualToNode other = (EqualToNode) obj;
        return getLeftOperand().equals(other.getLeftOperand())
                && getRightOperand().equals(other.getRightOperand());
    }

    @Override
    public int hashCode() {
        return Objects.hash(getLeftOperand(), getRightOperand());
    }
}